Earth Anomalies

ekim68

Mike
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Ancient tree tells chaotic tale of Earth’s magnetic field reversal

A perfectly preserved ancient tree fossil has offered scientists a unique peek into a moment 42,000 years ago when the Earth’s magnetic field went haywire. The impressive study paints a picture of temporary environmental chaos, potentially influencing everything from an increase in cave paintings to the extinction of the Neanderthals.

Without the Earth’s magnetic field we’d have a pretty hard time living on the planet. Beyond helping us simply navigate around the world with a compass, the Earth’s magnetic field is fundamental to the existence of life. It helps deflect harmful solar winds and keeps our protective atmosphere in place.
 

ekim68

Mike
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Messages
57,533
London-sized iceberg breaks off Brunt Ice Shelf in Antarctica

After years of suspense, an iceberg approximately the size of London has broken away from the Brunt Ice Shelf in Antarctica, only a few miles from the Halley British Antarctic Survey (BAS) ice station. The 490 square mile (1,270 sq km), 490 feet (150 m) thick sheet of ice is not seen as posing a direct threat to the station.

Though the calving of the giant iceberg was dramatic, it wasn't unexpected. Cracks have been appearing in the Brunt Ice Shelf for years, but the movements of ice is complex and often unpredictable, so the BAS has been keeping a close eye on developments and erring on the side of caution.
 

ekim68

Mike
Joined
Jul 8, 2003
Messages
57,533

ekim68

Mike
Joined
Jul 8, 2003
Messages
57,533
NASA Scientists Complete 1st Global Survey of Freshwater Fluctuation

To investigate humans’ impact on freshwater resources, scientists have now conducted the first global accounting of fluctuating water levels in Earth’s lakes and reservoirs – including ones previously too small to measure from space.

The research, published March 3 in the journal Nature, relied on NASA’s Ice, Cloud and land Elevation Satellite 2 (ICESat-2), launched in September 2018.

ICESat-2 sends 10,000 laser light pulses every second down to Earth. When reflected back to the satellite, those pulses deliver high-precision surface height measurements every 28 inches (70 centimeters) along the satellite’s orbit. With these trillions of data points, scientists can distinguish more features of Earth’s surface, like small lakes and ponds, and track them over time.
 

ekim68

Mike
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Messages
57,533
First-ever 'space hurricane' detected over the North Pole

For the first time, astronomers have detected a powerful, 600-mile-wide (1,000 kilometers) hurricane of plasma in Earth's upper atmosphere — a phenomenon they're calling a "space hurricane."

The space hurricane raged for nearly 8 hours on Aug. 20, 2014, swirling hundreds of miles above Earth's magnetic North Pole, according to a study published Feb. 22 in the journal Nature Communications.

Made from a tangled mess of magnetic field lines and fast-flying solar wind, the hurricane was invisible to the naked eye — however, four weather satellites that passed over the North Pole detected a formation not unlike a typical terrestrial hurricane, the study authors wrote.
 

ekim68

Mike
Joined
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Messages
57,533

Scientists stunned to discover plants beneath mile-deep Greenland ice


Scientists found frozen plant fossils, preserved under a mile of ice on Greenland. The discovery helps confirm a new and troubling understanding that the Greenland Ice Sheet has melted entirely during recent warm periods in Earth's history -- like the one we are now creating with human-caused climate change. The new study provides strong evidence that Greenland is more sensitive to climate change than previously understood -- and at risk of irreversibly melting.
 

ekim68

Mike
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Messages
57,533

Paleomagnetism suggests supercontinent cycle began two billion years ago


Geologists have pieced together an uncertain part of Earth’s ancient history. A team in Australia has found new evidence that suggests the cycle of supercontinents forming and breaking up only started about two billion years ago.

Our current arrangement of continents may look set in stone (pun not intended), but what we’re seeing and walking over are the fragments of the ancient supercontinent Pangaea, still drifting apart in a slow motion breakup that’s been going on for over 200 million years.
 

ekim68

Mike
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More than 5,000 tons of extraterrestrial dust fall to Earth each year


Every year, our planet encounters dust from comets and asteroids. These interplanetary dust particles pass through our atmosphere and give rise to shooting stars. Some of them reach the ground in the form of micrometeorites. An international program conducted for nearly 20 has determined that 5,200 tons per year of these micrometeorites reach the ground.
 

ekim68

Mike
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Messages
57,533

Melting ice sheets caused sea levels to rise up to 18 meters


A team of scientists, led by researchers from Durham University, used geological records of past sea levels to shed light on the ice sheets responsible for a rapid pulse of sea-level rise in Earth's recent past.

Geological records tell us that, at the end of the last ice age around 14,600 years ago, sea levels rose at ten times the current rate due to Meltwater Pulse 1A (MWP-1A); a 500 year, ~18 meter sea-level rise event.
 

ekim68

Mike
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